The blower motor for the ac/heat unit on the Yukon is constantly on and I can only turn it off by pulling what I thought was a fuse for the blower unit in the engine compartment fuse box. I was told that this may in fact be a relay and not a fuse and that it may be "stuck". I took it in for service with the same exact problem when the vehicle was under warranty and now the dealer is reluctant to address the problem now that the warranty has expired.
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The first thing i would check is the heater blower motor for power.If the blower motor has power then pull and wiggle on the blower motor resistors pigtail or connector but make sure the heater and fan motor and the ignition switch are turn on so you can here if the motor comes on. A lot of times these blower motor resistors get hot enough to melt the connector causing it to loose its connection.
Check the connectors to the AC blower motor switch and the motor itself, see if they are burnt/discolored, replace as needed. Also replace the blower motor. The repair connectors are available from the dealer.